Weld County residents opposed to the proposed uranium mine near Nunn are still not convinced their groundwater will be protected from contamination. Last year, Gov. Ritter signed legislation to protect groundwater from contamination as a result of leach uranium mining. House Bill 1161 requires that companies using leach uranium mines restore all affected groundwater to the condition it was in before mining. A new study, however, shows that these types of regulations may not prevent all groundwater contamination. Weld residents now are using this information as their primary argument against the uranium mine.